Lin Yang1, Shouqin Zhao2, Zhonglin Liu1, Danni Wang1, Ran Ren1. 1. Department of Otolaryngology Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China. 2. Department of Otolaryngology Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China. Email: shouqinzhao@163.com.